M. Loreti

Performance of a prototype of the CMS central detector

A prototype of the barrel Tracking Detector of the Compact Muon Solenoid (CMS) experiment proposed for LHC was built and tested in a beam and in a magnetic field of up to 3 T. It contained six microstrip gas chambers, 25 cm long, and three double-sided silicon microstrip detectors, 12.5 cm long. We report some preliminary results on the performance of the chambers.

The CDF silicon vertex detector: an overview and test results

The final design and construction of a 46080 channel silicon microstrip vertex detector (SVX) for the Collider Detector Facility (CDF) experiment at the Tevatron collider are described. The system performance of the front end electronics employing a custom VLSI readout chip and the mechanical support and cooling systems for the 0.7 m/sup 2/ silicon detector are discussed. The authors present performance results from initial testing of individual components through final testing of the full system of detectors, readout, cooling, and data acquisition. Preliminary results from cosmic ray triggered data are also described.<<ETX>>

Construction of the CDF silicon vertex detector

Technical details and methods used in constructing the Collision Detector Facility (CDF) silicon vertex detector are presented. Attention is given to the foam-carbon fiber composite structure used to support the silicon microstrip detectors and the procedure for achievement of 5- mu m detector alignment. The construction of the beryllium barrel structure, which houses the detector assemblies, is also described. In addition, the 10- mu m placement accuracy of the detectors in the barrel structure is discussed, and the detector cooling and mounting systems are described. The construction of the CDF silicon vertex detector has been completed. The silicon strip detectors are located to an accuracy of 10 mu m and >98-5% of the silicon strips are fully functional.<<ETX>>

The CMS tracker front-end and control electronics in an LHC like beam test

A complete prototype of the CMS tracker read-out and control system has been built using components as close as possible to the final design. It is based on an amplifier and analogue pipeline memory chip (APV), analogue optical links transmitting at 40Ms/s and a VME mounted digitisation and data handling board (FED-PMC), supplemented by a control architecture based on FECs which set and monitor the components of the entire system. This system has been successfully operated for the first time under LHC like beam conditions in a 25ns structured beam provided by the SPS at CERN. The objective was primarily to test the synchronisation and pile-up effects in a high trigger rate environment and to examine the many issues involved in operating a complete readout and control system.

Online monitoring of radiation damage in optical fibers

Abstract We report on the construction and the performance of a setup which is monitoring the transmission of optical materials during irradiation with a measurement precision of about 2%.